MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
I made them in Meshmixer. Designing supports is a bit of an art form in and of itself, but I think that it's an important skill for 3D printing minis. I've actually written quite a lot about it on my blog at https://objectforge.blogspot.com/search/label/Supports if you're interested in reading about how I design supports.